﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Text.RegularExpressions;
using DotRas;  
namespace VPNClient
{
    class VPNHelper
    {
        // 系统路径 C:\windows\system32\  
        private static string WinDir = Environment.GetFolderPath(Environment.SpecialFolder.System) + @"";  
        // rasdial.exe  
        private static string RasDialFileName = "rasdial.exe";  
        // VPN路径 C:\windows\system32\rasdial.exe  
        private static string VPNPROCESS = WinDir + RasDialFileName;  
        // VPN地址  
        public string IPToPing { get; set; }  
        // VPN名称  
        public string VPNName { get; set; }  
        // VPN用户名  
        public string UserName { get; set; }  
        // VPN密码  
        public string PassWord { get; set; }  
  
        public VPNHelper()  
        {  
        }  
        /// <summary>  
        /// 带参构造函数  
        /// </summary>  
        /// <param name="_vpnIP"></param>  
        /// <param name="_vpnName"></param>  
        /// <param name="_userName"></param>  
        /// <param name="_passWord"></param>  
        public VPNHelper(string _vpnIP, string _vpnName, string _userName, string _passWord)  
        {  
            this.IPToPing = _vpnIP;  
            this.VPNName = _vpnName;  
            this.UserName = _userName;  
            this.PassWord = _passWord;  
        }  
        /// <summary>  
        /// 尝试连接VPN(默认VPN)  
        /// </summary>  
        /// <returns></returns>  
        public void TryConnectVPN()  
        {  
            this.TryConnectVPN(this.VPNName,this.UserName,this.PassWord);  
        }  
        /// <summary>  
        /// 尝试断开连接(默认VPN)  
        /// </summary>  
        /// <returns></returns>  
        public void TryDisConnectVPN()  
        {  
            this.TryDisConnectVPN(this.VPNName);  
        }  
        /// <summary>  
        /// 创建或更新一个默认的VPN连接  
        /// </summary>  
        public void CreateOrUpdateVPN()  
        {  
            this.CreateOrUpdateVPN(this.VPNName, this.IPToPing);  
        }  
        /// <summary>  
        /// 尝试删除连接(默认VPN)  
        /// </summary>  
        /// <returns></returns>  
        public void TryDeleteVPN()  
        {  
            this.TryDeleteVPN(this.VPNName);  
        }  
        /// <summary>  
        /// 尝试连接VPN(指定VPN名称，用户名，密码)  
        /// </summary>  
        /// <returns></returns>  
        public void TryConnectVPN(string connVpnName,string connUserName,string connPassWord)  
        {  
            try  
            {  
                string args = string.Format("{0} {1} {2}", connVpnName, connUserName, connUserName);  
                ProcessStartInfo myProcess = new ProcessStartInfo(VPNPROCESS, args);  
                myProcess.CreateNoWindow = true;  
                myProcess.UseShellExecute = false;  
                Process.Start(myProcess);  
            }  
            catch (Exception Ex)  
            {  
                Debug.Assert(false, Ex.ToString());  
            }  
        }  
        /// <summary>  
        /// 尝试断开VPN(指定VPN名称)  
        /// </summary>  
        /// <returns></returns>  
        public void TryDisConnectVPN(string disConnVpnName)  
        {  
            try  
            {  
                string args = string.Format(@"{0} /d", disConnVpnName);  
                ProcessStartInfo myProcess = new ProcessStartInfo(VPNPROCESS, args);  
                myProcess.CreateNoWindow = true;  
                myProcess.UseShellExecute = false;  
                Process.Start(myProcess);  
     
            }  
            catch (Exception Ex)  
            {  
                Debug.Assert(false, Ex.ToString());  
            }  
        }  
        /// <summary>  
        /// 创建或更新一个VPN连接(指定VPN名称，及IP)  
        /// </summary>  
        public void CreateOrUpdateVPN(string updateVPNname,string updateVPNip)  
        {  
            RasDialer dialer = new RasDialer();  
            RasPhoneBook allUsersPhoneBook = new RasPhoneBook();  
            allUsersPhoneBook.Open();  
            // 如果已经该名称的VPN已经存在，则更新这个VPN服务器地址  
            if (allUsersPhoneBook.Entries.Contains(updateVPNname))  
            {  
                allUsersPhoneBook.Entries[updateVPNname].PhoneNumber = updateVPNip;  
                // 不管当前VPN是否连接，服务器地址的更新总能成功，如果正在连接，则需要VPN重启后才能起作用  
                allUsersPhoneBook.Entries[updateVPNname].Update();                 
            }  
            // 创建一个新VPN  
            else  
            {  
                RasEntry entry = RasEntry.CreateVpnEntry(updateVPNname, updateVPNip, RasVpnStrategy.PptpFirst, RasDevice.GetDeviceByName("(PPTP)", RasDeviceType.Vpn));  
                allUsersPhoneBook.Entries.Add(entry);  
                dialer.EntryName = updateVPNname;  
                dialer.PhoneBookPath = RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.AllUsers);                 
            }  
        }  
        /// <summary>  
        /// 删除指定名称的VPN  
        /// 如果VPN正在运行，一样会在电话本里删除，但是不会断开连接，所以，最好是先断开连接，再进行删除操作  
        /// </summary>  
        /// <param name="delVpnName"></param>  
        public void TryDeleteVPN(string delVpnName)  
        {  
            RasDialer dialer = new RasDialer();  
            RasPhoneBook allUsersPhoneBook = new RasPhoneBook();  
            allUsersPhoneBook.Open();  
            if (allUsersPhoneBook.Entries.Contains(delVpnName))  
            {  
                allUsersPhoneBook.Entries.Remove(delVpnName);  
            }  
        }  
        /// <summary>  
        /// 获取当前正在连接中的VPN名称  
        /// </summary>  
        public List<string> GetCurrentConnectingVPNNames()  
        {  
            List<string> ConnectingVPNList = new List<string>();  
            Process proIP = new Process();  
            proIP.StartInfo.FileName = "cmd.exe ";  
            proIP.StartInfo.UseShellExecute = false;  
            proIP.StartInfo.RedirectStandardInput = true;  
            proIP.StartInfo.RedirectStandardOutput = true;  
            proIP.StartInfo.RedirectStandardError = true;  
            proIP.StartInfo.CreateNoWindow = true;//不显示cmd窗口  
            proIP.Start();  
            proIP.StandardInput.WriteLine(RasDialFileName);  
            proIP.StandardInput.WriteLine("exit");  
            // 命令行运行结果  
            string strResult = proIP.StandardOutput.ReadToEnd();  
            proIP.Close();  
            // 用正则表达式匹配命令行结果，只限于简体中文系统哦^_^  
            Regex regger = new Regex("(?<=已连接\r\n)(.*\n)*(?=命令已完成)", RegexOptions.Multiline);  
            // 如果匹配，则说有正在连接的VPN  
            if (regger.IsMatch(strResult))  
            {  
                string[] list = regger.Match(strResult).Value.ToString().Split('\n');  
                for(int index = 0 ; index < list.Length;index++)  
                {  
                    if (list[index]!=string.Empty)  
                    ConnectingVPNList.Add(list[index].Replace("\r",""));  
                }  
            }  
            // 没有正在连接的VPN，则直接返回一个空List<string>  
            return ConnectingVPNList;  
        }  
    }
}
